The formula is:
Perimeter = (length of one side) x (number of sides)
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Multiple of total no of sides and length of each side.
The general formula isPerimeter = (sum of the lengths of all sides)In the special case of a regular polygon,Perimeter = (length of one side) x (number of sides)
The formula for finding the area (A) of a regular polygon when its perimeter (p) and apothem (a) are known is: A=(pa)/2 Therefore, when the figures are put into the formula it becomes: A=(20 x 3)/2 A=60/2 A=30 square feet
There can be no such formula in general. A formula will exist if the area is a regular polygon (or a circle).
Assuming that you are talking about a regular hexagon, the equation is (1/2)ap, a being the apothem and pbeing the perimeter. You can also use that equation for any other regular polygon.